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Allow to override build date with SOURCE_DATE_EPOCH

Bernhard M. Wiedemann requested to merge bmwiedemann/cligen:date into main

Allow to override build date with SOURCE_DATE_EPOCH to make builds reproducible. See https://reproducible-builds.org/ for why this is good and https://reproducible-builds.org/specs/source-date-epoch/ for the definition of this variable.

Also use UTC/gmtime to be independent of timezone.

Without this patch, build results had such a diff:

--- zcat RPMS.1/usr/share/man/man1/gnutls-cli.1.gz
+++ zcat RPMS.2/usr/share/man/man1/gnutls-cli.1.gz
[...]
-.TH gnutls-cli 1 "18 Feb 2023" "3.7.9" "User Commands"
+.TH gnutls-cli 1 "26 Mar 2024" "3.7.9" "User Commands"

This patch was done while working on reproducible builds for openSUSE, sponsored by the NLnet NGI0 fund.

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